21
Vertiv I Liebert ITA2 30kVA I Manual
2.6
Connecting Power Cables
I/O cables and battery cables are required for connection. When connecting the cables, you
should follow the local wiring regulations, take the environment situation into account, and
refer to
Table 3B of IEC60950-1.
The max. current in different operating modes is listed in Table 2-2, the recommended min.
cable CSA is listed in Table 2-3. Select the appropriate cables according to Table 2-2 and
Table 2-3
.
Table 2-2
Max. steady state AC and DC current
UPS rated
power (kVA)
Rated current (A)
Max. input phase current
1, 2
Max. output phase current
2
Max. battery discharging
current (A)
220V
230V
240V
220V
230V
240V
30kVA
62
59
57
45
43
42
86
When the battery cables are selected, the maximum allowable voltage drop is 4Vdc
according to the current value shown in this table. Do not ring the cables to avoid
increasing the electromagnetic interference (EMI).
1: The input mains current of the rectifier and the bypass.
2: Non-linear load (switch mode power) affects the neutral cable design of the
output and the bypass. The neutral cable current may exceed the rated phase
current, up to1.732 times as large as the rated current.
Table 2-3
Single UPS cable CSA (unit: mm
2
, ambient temperature: 25°C
）
Model
Input
Output
Bypass
Neutral
cable
PE
Battery
Battery
PE
30kVA
16
10
10
16
16
25
25
CSA (unit: mm
2
)
Terminal type
4
OT4-6
6
OT6-6
10
RNBS8-6
16
RNBS14-6
25
RNBS22-6
The recommended I/O MCB capability of the UPS is listed in Table 2-4; select the MCBs
according to your requirements.
The earth leakage current of the UPS can cause false tripping of the input Circuit
breaker. Therefore, we do not recommend to use an MCB with leakage current
protection at upstream of UPS.
The specified upstream breakers below are required to obtain the conditional
short-circuit current rating, Icc at 10kA symmetrical rms. The specified upstream
breakers should comply with an IEC 60947 series standard.
